Motorcycle frame



FIG. 1 is a front elevational view of a motorcycle frame showing my novel design;

FIG. 2 is a back elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a motorcycle frame, as shown and described. 